The Five Ten Guide Tennie shoes feature a Nubuck leather upper & a Stealth C4 Dotty outsole. The midsole & outsole regulate flexibility & diminish friction, while the internal rocker promotes a healthier stride. Glossary: Nubuck:A type of leather with a soft, velvety surface that is far more durable than suede. Stealth C4:A rubber sole used by many top climbers that provides excellent edging & high friction.